ssc - 419 supplemental commercial design guidance for fatigue ship ...

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Structural Design of the Ship Hull GirderGeneral Cargo ShipsSection 3-2-5/13.7 Longitudinal Frames (1995)The section modulus, SM, of each longitudinal side frame is to be not less than obtainedfrom the following equation:SM = 7.8chsl 2 (cm 3 ) SM = 0.0041chsl 2 (in. 3 )Wheres = spacing of longitudinal frames in meters or feetc = .95h (above 0.5D from the keel) = the vertical distance in m or ft from the longitudinal frameto the bulkhead or freeboard deck, but is not to be taken as less than 2.13 m (7.0 ft).(at and below 0.5D from the keel) = 0.75 times the vertical distance in m or ft fromthe longitudinal frame to the bulkhead or freeboard deck, but not less than 0.5D.Vessels Intended to Carry Oil in BulkSection 5-1-4/9.5 (Ships with length greater than 150 meters)Deck and Side Longitudinals (1995) [SafeHull classification notation is required.]The net section modulus of each individual side or deck longitudinal, in association withthe effective plating to which it is attached, is to be not less than obtained from the followingequation:SM = M/f b cm 3 (in 3 )M = 1000psl 2 /k N-cm (kgf-cm, lbf-in.)where:k = 12(12, 83.33)p = nominal pressure in N/cm 2 (kgf/cm 2 , lbf/in 2 ) at the side longitudinal considered asspecified in Table 5/2A.3.1.= nominal pressure in N/cm 2 (kgf/cm 2 , lbf/in 2 ), as defined in Table 5/2A.3.1 for decklongitudinals.s and l are as defined in 5/2A.4.3.3.f b = permissible bending stresses, in N/cm 2 (kgf/cm 2 (lbf/in 2 )= (1.0 - 0.60 α 2 SM RD /SM D )S m f y for deck longitudinals= 1.0[0.86 - 0.52 α 1 (SM RB /SM B )(y/y n )]S m f y ≤ 0.75 S m f y for side longitudinals belowneutral axis= 2.0[0.86 - 0.52 α 2 (SM RD /SM D )(y/y n )]S m f y ≤ 0.75S m f y for side longitudinalsabove neutral axisα 2 = S m2 f y2 /S m f yS m , f y and α 1 are as defined in 5/2A.4.3.3.S m2 = strength reduction factor as obtained from 5/2A.4.3.2a for the steel grade of topflange material of the hull girder.f y2 = minimum specified yield point of the top flange material of the hull girder in N/cm 2(kgf/cm 2 , lbf/in 2 )2-4
Structural Design of the Ship Hull GirderSM RD = reference net hull-girder section modulus based on the material factor of the topflange of the hull girder in cm 2 -m (in 2 -ft) = 0.92 SMSM D = net design hull girder section modulus at the deck in cm 2 -m (in 2 -ft)SM RB and SM B are as defined in 5/2A.4.3.2a.y = vertical distance in m (ft) measured from the neutral axis of the section to thelongitudinal under consideration at its connection to the associated plateSM = required hull-girder section modulus in accordance with 3/6.3.4 and 3/6.5.3 basedon the material factor of the top flange of the hull-girder in cm 2 -m (in 2 -ft).y n = vertical distance in m (ft) measured from the deck (bottom) to the neutral axis of thesection, when the longitudinal under consideration is above (below) the neutral axis.Section 5-2-2/153/2/1 (Ships with length less than 150 meters) Structural Sections[Not included in SafeHull.]Each structural section for longitudinal frames, beams, or bulkhead stiffeners, inassociation with the effective plating to which it is attached, is to have a section modulus, SM,not less than obtained from the following equation:SM = 7.8chsl 2 (cm 3 ) SM = 0.0041chsl 2 (in. 3 )s = spacing of longitudinal frames in m or ftc = .95 for side longitudinalsh = distance in m or ft from the longitudinals…to a point located 1.22 m (4 ft) above thedeck at side amidships in vessels of 61 m (200 ft) in length, and to a point located2.44 m (8 ft) above the deck at side amidships in vessels of 122 m (400 ft) in lengthand above; at intermediate lengths h is to be measures to intermediate height abovethe side of the vessel.Vessels Intended to Carry Containers (130 meters to 350 meters in Length)Section 5-5-4/13.3 Side Longitudinals and Side Frames (1998)The net section modulus of each side longitudinal or side frame, in association with theeffective plating is to be not less than obtained from the following equations:SM = M/f b cm 3 (in 3 )M = c p s l 2 10 3 /k N-cm (kgf-cm, lbf-in.)wherec = 1.0without strutsc = 0.65with effective strutsp = nominal pressure, in N/cm 2 (kgf/cm 2 , lbf/in 2 ), at the side longitudinal considered, asspecified in 5-5-3/Table 2, but is not to be taken less than 2.25 N/cm 2 (0.23 kgf/cm 2 ,3.27 lbf/in 2 ). For side frames, pressure is to be taken at the middle of span of sideframe.s = spacing of side longitudinals or side frames, in mm (in.)l = span of longitudinals or frames between effective supports, as shown in 5-5-4/Figure8, in m (ft)2-5
Page 1: SSC - 419SUPPLEMENTAL COMMERCIALDES
Page 4 and 5: CONVERSION FACTORS(Approximate conv
Page 6: able to be applied to a naval ship.
Page 9 and 10: Whipping—Vibration of the hull gi
Page 11 and 12: Table of ContentsSection Title Page
Page 13 and 14: Section Title Page8.2 Commercial Sh
Page 15 and 16: Figure Title Page5.4 Design Code S/
Page 17 and 18: 1.2 Commercial Approaches and Pract
Page 19 and 20: Navy have standards for hull girder
Page 21 and 22: 2. Current Commercial Practicesfor
Page 23: Structural Design of the Ship Hull
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Fatigue Data for Ship Structural De
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Supplemental Commercial Design Guid
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11. Suggested Modifications to the
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Suggested Modifications to the Safe
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12. CONCLUSIONSThe ABS SafeHull Pha
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13. RECOMMENDATIONSThe following re
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14. REFERENCESAASHTO, Standard Spec
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ReferencesHeyburn, R. and D. Riker,
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ReferencesNaval Ships’ Technical
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ReferencesSNAME, Application of Pro
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Guide for the Use of Commercial Des
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Phase A analysis. This guide provid
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Table 1 Stiffener Library Data File
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SafeHull, so it is not necessary to
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Figure 4 General Data for Section D
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to define the Bilge, Gunwale, or In
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Figure 6 The Stiffener Properties S
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Figure 7 2-D Shell Shape Definition
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produce a screen similar to Figure
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in sequence. If errors are found in
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7.2.2.2 Once the SafeHull Phase A h
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many limitations associated with th
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App A-1APPENDIX AFATIGUE ANALYSIS S
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App A-3STF#SafeHullSTF IDTOE ID Dis
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App A-5Table A.2 SafeHull Phase A F
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App A-7STF#Table A.3 SafeHull Phase
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App A-9STF#SafeHullSTF IDTOE ID Dis
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App A-11CutoutLABELID LOCDist.fromB
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App B-2STF#SafeHullSTF IDTable B.1
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App B-4STF#SafeHullSTF IDTOE ID Dis
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App B-10CutoutLABEL ID LOCTable B.2
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App C-1APPENDIX CFATIGUE ANALYSIS S
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App C-3STF#SafeHullSTF IDTOE ID Dis
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App C-9CutoutLABELID LOCDist.fromBL
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App C-11STF#SafeHullSTF IDTOE IDDis
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App C-17CutoutLABELID LOC Dist.from
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App D-2Table D.1 SafeHull Phase A F
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App D-4STF#SafeHullSTF IDTOE IDDist
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App D-6Table D.2 SafeHull Phase A F
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App D-8STF#SafeHullSTF IDTOE IDDist
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App D-10STF#SafeHullSTF IDTOE IDDis
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App E-1APPENDIX EFATIGUE ANALYSIS S
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App E-3STF#SafeHullSTF IDTOE ID Dis
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App E-5STF#SafeHullSTF IDTOE ID Dis
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App E-7STF#SafeHullSTF IDTOE IDDist
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App E-9STF#SafeHullSTF IDTOE IDDist
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App F-2Table F.1 SafeHull Phase A F
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App F-4FatigueSTF Stiffener " ID Di
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App F-6FatigueSTF Stiffener " ID Di
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App F-8Table F.2 Phase A Fatigue An
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App G-2ST#StiffenerTable G.1 SafeHu
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App G-4ST#StiffenerTOE ID Dist.from
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App G-6ST#StiffenerTOE ID Dist.from
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App G-8CutoutTable G.2 Phase A Fati
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App G-10CutoutDist.fromBL(m)Long`lS
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App G-12STF#Stiffener TOE ID Dist.f
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App G-18Table G.4 Phase B Analysis
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App H-1APPENDIX HFATIGUE ANALYSIS S
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App H-3ST#StiffenerSafeHullSTF IDTO
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App H-5ST#StiffenerSafeHullSTF IDTO
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App H-7CutoutTable H.2 Phase A Fati
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App I-1APPENDIX IFATIGUE ANALYSIS S
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App I-3STF#SafeHullSTF IDTOEID Dist
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App I-11STF#SafeHullSTF IDTOEID Dis
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App I-13CutoutLABELID LOCTable I.2
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App I-15Table I.3 Phase A Fatigue A
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App I-27CutoutLABELID LOCDist.fromB
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App J-2STF#SafeHullSTF IDTOETable J
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App J-4STF#SafeHullSTF IDTOEID Dist
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App J-6CutoutLABELID LOCTable J.2 P
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App J-8CutoutLABELID LOCDist.fromBL
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App J-10CutoutLABELID LOCDist.fromB
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APPENDIX KOPNAV Instruction 4700.7J
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(4) Preventive maintenance actions
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the Integrated Logistic Support (IL
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(2) Operational Forces Resource Spo
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APPENDIX LS9086-CN-STM-040Naval Shi
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Naval Ship’s Technical Manual Cha
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Table 079-53-1. Source Documents fo
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1230/004Contaminated Oil Tank Clean
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is, full cleaning) is attributable
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Ships Technical Manual Chapter 631,
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090-1.70 Shaft Alley. Particular em
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cladding or surfacing shall be acco
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APPENDIX MUnderwater Ship Husbandry
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Section 2 Personnel and Equipment R
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the average percent of block areas
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APPENDIX NThe Corrosion Control Inf
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APPENDIX OUnited States CodeTitle 1
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